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credo
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A static code analysis tool with a focus on code consistency and teaching.
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Files
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Files
lib/credo/check/consistency/parameter_pattern_matching.ex
defmodule Credo.Check.Consistency.ParameterPatternMatching do
@moduledoc """
When capturing a parameter using pattern matching you can either put the name before or after the value
i.e.
def parse({:ok, values} = pair)
or
def parse(pair = {:ok, values})
While this is not necessarily a concern for the correctness of your code,
you should use a consistent style throughout your codebase.
"""
@explanation [check: @moduledoc]
@code_patterns [
Credo.Check.Consistency.ParameterPatternMatching.PositionCollector
]
alias Credo.Check.Consistency.Helper
alias Credo.Check.PropertyValue
use Credo.Check, run_on_all: true, base_priority: :high
@doc false
def run(source_files, params \\ []) when is_list(source_files) do
source_files
|> Helper.run_code_patterns(@code_patterns, params)
|> Helper.append_issues_via_issue_service(&issue_for/5, params)
:ok
end
defp message_for(:after) do
"the variable name after the pattern"
end
defp message_for(:before) do
"the variable name before the pattern"
end
defp issue_for(_issue_meta, _actual_props, nil, _picked_count, _total_count), do: nil
defp issue_for(_issue_meta, [], _expected_prop, _picked_count, _total_count), do: nil
defp issue_for(issue_meta, actual_prop, expected_prop, _picked_count, _total_count) do
line_no = PropertyValue.meta(actual_prop, :line_no)
actual_prop = PropertyValue.get(actual_prop)
format_issue issue_meta,
message: "File has #{message_for(actual_prop)} while most of the files have #{message_for(expected_prop)} when naming parameter pattern matches",
line_no: line_no
end
end